Zombie survival mod DayZ takes place in the nation of Chernarus, which sounds entirely made-up, but it's only mostly made up. The geography of the map is actually lifted from a real-world location, around Povrly, in the north of the Czech Republic.

Which is what makes this cosplay expedition so awesome. They're not only in costume, complete with authentic props like guns, beans and, um, soda, but they're walking the actual roads and actual hills featured in the game/mod. There aren't many video games that let you get that into something.